Rock drill bit



FIG. 1 is top perspective view of a first embodiment of a rock drill bit, showing my new design.

FIG. 2 is a bottom perspective view thereof.

FIG. 3 is a bottom plan view thereof.

FIG. 4 is a top plan view thereof.

FIG. 5 is a right side elevational view thereof.

FIG. 6 is a left side elevational view thereof.

FIG. 7 is a front elevational view thereof.

FIG. 8 is a rear elevational view thereof.

FIG. 9 is top perspective view of a second embodiment of the rock drill bit, showing my new design.

FIG. 10 is a bottom perspective view thereof.

FIG. 11 is a bottom plan view thereof.

FIG. 12 is a top plan view thereof.

FIG. 13 is a right side elevational view thereof.

FIG. 14 is a left side elevational view thereof.

FIG. 15 is a front elevational view thereof; and,

FIG. 16 is a rear elevational view thereof.

The evenly-broken dash-dash lines in the views depict environmental features for illustrative purposes only and form no part of the claimed design. The broken dot-dash lines in the views define peripheral boundaries of the claimed design and are not part of the claimed design. 

CLAIM The ornamental design for a rock drill bit, as shown and described. 